Electric drying apparatus.



W. K. MASON. ELECTRIC DRYING APPARATUS.

urmuuxox nun APB-.28, 1914.

Patented Aug. 18, 1914,

preferably a tube of asbestos or s PIE WILLIAM KENNEDY MASON, 0F CAMBRIDGE, MASSACHUSETTS, ASSIGNOE T0 JOHN W. BURNETT, OF CAMBRIDGE, MASSACHUSETTS.

nnnc'rmc name APPARATUS.

Specification of Ietters'JPatent.

Patented Aug. 18, 1914.

- Application filed April 28, 1914. Serial 1%. 834,942.

heated apparatus for drying purposes, and

particularly to apparatus for drying the human scalp and the hair thereon.

The invention has for its object to enable the temperature of the heat-applying part or applicator of an electrically heated drying apparatus to be automatically maintained at substantially a predetermined de gree, and to prevent the possibility of burnmg the object or objects being dried.

The invention consists 'in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification; Figure l represents a side elevation of a hair and scalp drying apparatus embodying my invention;

F 1g. 2 represents a side elevation of the same, partly in section; Fig. 3 represents a section on line 33 of Fig. 2; Fig. 4 represents an enlarged longitudinal section of the thermostatic arm hereinafter referred to.

The same reference characters indicate;

13 and included in an electric circuit which also includes circuit wire portions 14 and 15 connected with opposite ends of the coil 12, and a circuit wire 16. The core 13 is mica supported by an inner tube 13 of metal, the tube 13 insulating the coil inner tube 13. The wires 14 and 16 may extend through a handle 17, the wire 16 being connected with a fixed contact member 18 .19 represents a thermostatic circuit breaking and closing member or armwhich is an electrical conductor connected with the Wire '15, said arm being composed of two or more metal layers having different coefiicients of expansion and contraction. The arm 19 is 12 from the I therefore adapted to be deflected by an increase of temperature and separated from the member 18 to break the circuit and to be a returned to its normal shape by cooling to again make contact with the member 18.

' The heating unit is inclosed in a tubular heat conducting holder 21 from which it is insulated by a lining tube 22 of asbestos, which not only insulates the coil 12 from the holder 21, but also serves to store, and diffuse, or uniformly distribute the heat therefrom, and prevent the coil 12 and the core which supports it from rattling in the holder, the asbestos lining being compressible and constituting a yielding packing. Projecting from the .holder 21 is a heatconducting extension which as here shown is composed of" spaced flanges 23 of heatconducting material, the circuit controlling members 18 and 19 being secured to one of said flanges by suitable fastenings, such as screws 24, as shown by Fig. 2. Said flanges constitute a socket or coupling member to engage the applicator next described.

25 represents a comb-shaped applicator of heat-conducting material, preferably aluminum. The back of said applicator is formed to have a close. frictional fit between the flanges 23, so that the applicator is detachably connected with the heating portion of the apparatus and may be conveniently removed to be cleaned and sterilized.

When the circuit is closed by contact of the members 18 and 19 with each other, the

holder 21 is heated by the coil 12, and heat is conducted therefrom through the flanges 23 to the applicator. When the tem erature of the socket rises above a pre etermined degree the circuit is broken by the expansion of the thermostatic arm or member 19 until the temperature is sufliciently lowered. Provision is therefore made for automatically regulating the temperature of the applicator and maintaining it at a substantially uniform degree so that liability of burning the subject operated on by the drier is prevented.

It will be seen that the automatic circuit controller composed of the members 18 and 19 is located on the heat-conducting extension and between the heating unit and the applicator and in close proximity to the latter, so that the applicator is kept at substanti-ally the same temperature as the extension or socket, i snrrongenient is p'ortont,'becnuse it insures n .snitnbie ternperoture of the applicator at all times, nnoi edjnsteci toy .with in bnse plate 34 to Whi the nrin 19 prevents the applicator from cooling below-f the requisite drying tern erntnre,

'ihe holder '21 is pro ercbiy inccsen in n tubular sheath 30 of a material which is n poor conductor of heat.

dle may be omitteci, however, if desireo.

In Fig. 2 I have shown diagrammatically n'source of electrical energy31,nnd connec-" tions .ioetween it and the Wiree 16 end '17.

Said-connections may nclude plugs insertiblein eoekets 32 at the outer end of thehnncile'liy The "thermostatic nrrn l9 rney be e benring screw 33' engaged .is attached by screws 35.

It is obvious that my inrention may Toe embodied in en apporatns homing on, elec-i tricai heating unit oi oiiierent construction", from that here shown, and tiint cntor may be permanently 25 detachable therefrom.

the nppiisecured to the. hoot-conducting extension instead of being The members 18 and n cover 36. I Having described m invention, .1 cinirnz' 1. A drier of the c nrocter stated, com-i prising an eljectricoi heating unit, including or heating circuit, o ubulnr hoot-conducting i9 ore protected by -'hoi ier .inciosing soldtunit ondi 'hevin,

' intercity projecting extension to eon not heat therefrom, n tnerrnostotic'circuit controller cnrricdi:

ocinptecl to nntomoticniiy .reguiote the tern-1 perntnre thereof, onci n corn o-ehoperiiientconducting opphcotor timing Tonctt in con tent with :enid enteneion to Saicl sheath may e integral "with the handle .17. ,Seidl 'f'nnn- I to} coupling member therein, n, tubular flhent-coniiuctin by said extension -nnc1 eondnct irentE gionein imityto the circuit contro ier 2. A" drier of "the character etoteci oomprieing em electrical heating unit, iinein ciing n heating circui't n lheet-cononctmg homer connecteci with said to comiluct 'heet inclosing mid remnant, on beck new in cioee proxinsulating and heot-difius'ing eornpbie revent rottiing' of the coil nndl core in the drier, nnii o vlaterally projecting extension to conduct bent from the holder, n thermostatic circuit eontroilcr carried by said. extension nndi oriepteoi to nntomnticnily regulate the temperature material, noiepteti to thereof, and n comb-shaped heat-conducting applicator honing nioncir in contoct with soid beck 'ioeing in close proximity to the circuit controller. 7

In testimony whereof it have "my signature, in preeenme of two Witneesee.

i-"-Witneseee: Y 2 1 GUL Eeown,

wrnnrnir rrnnnnnr irneo nf,

said extension to connect hoot therefrom, v. 

